| Forest Hill to Ickenham | 4,758.13 mi (7,657.46 km) |
| Forest Hill to Ifield | 4,780.83 mi (7,694.01 km) |
| Forest Hill to Ilford | 4,778.67 mi (7,690.53 km) |
| Forest Hill to Ilfracombe | 4,625.11 mi (7,443.40 km) |
| Forest Hill to Ilkeston | 4,682.88 mi (7,536.37 km) |
| Forest Hill to Ilkley | 4,636.00 mi (7,460.92 km) |
| Forest Hill to Immingham | 4,704.41 mi (7,571.02 km) |
| Forest Hill to Ince-in-Makerfield | 4,618.01 mi (7,431.97 km) |
| Forest Hill to Inverness | 4,454.22 mi (7,168.38 km) |
| Forest Hill to Inverurie | 4,523.04 mi (7,279.13 km) |
| Forest Hill to Ipswich | 4,803.67 mi (7,730.76 km) |
| Forest Hill to Irlam | 4,627.34 mi (7,446.99 km) |
| Forest Hill to Irthlingborough | 4,728.47 mi (7,609.74 km) |
| Forest Hill to Irvine | 4,485.90 mi (7,219.36 km) |
| Forest Hill to Islington | 4,771.85 mi (7,679.56 km) |
